NiAl Diffusion Coatings on Ineonel 738 using a Pre-Heated AlCl_3 + H_2 Gas Mixture

摘要

Aluminized diffusion coatings were obtained on an Inconel 738 specimen at 800-1000℃ using a preheated AlCl_3 + H_2 gas mixture with a 0.3 s holding time. It was found that the pre-heating treatment was very effective for a high deposition rate of the aluminide coatings. The thickness of the aluminide coatings was 1.5-4.7 times higher than that without preheating.